Coil-casing.



N9. 759,927. 'PATENTED MAY 17, 1904. c. F. SPLITDORF. COIL CASING APPLICATION FILED JULY 24, 1903- N0 MODEL.

Mme ea UNITED STATES Patented May 17, 1904.

PATENT OFFICE.

COIL-CASING.

SPECIFICATION forming part of Letters Patent No. 759,927, dated May 17, 1904.

Application filed July 24, 1903. Serial No. 166.890. (No model.)

To all whom it may concern: I I

Be it known that I, CHARLES F. SPLITDORF, a citizen of the United States of America, and a resident of the borough of Manhattan, in the city, county, and State of New York, have invented certain new and useful Improvements in Coil-Casings, of which the following is a specification.

This invention relates to coil-casings, and it refers particularly to the casings made of wood or other non-conducting material which are employed to contain the component elements of an induction orjump-spark coil, the features of novelty whereof may be summarized as follows: first, means providing a dust and moisture proof closure for coil-casings consisting in notching, respectively, obversely and inversely the opposite meeting edges of the closure members, thus furnishing a double parallel protecting-shield to exclude disturbing elements from the interior of the coil-casing; second, in conjunction with said closure, the formation of inclined orifices leadingfrom the upper surface of the coil insulation through said insulation and. downwardly through a side wall of the casing and the application of closely-fitting insulating-tubes within said orifices to serve as passages for the conductor-wires; third, in conjunction with a coil-casing, an exterior inclosure for the secondary-terminal connections.

In the drawings accompanying this application, Figure 1 is a side elevation, partly broken away at the top, of my improved coil-casing. Fig. 2 is a plan view thereof with the cover removed, and Fig. 3 is a detail view of one of the secondary-terminal inclosures.

As is well-known, the manner in which the covers of coil-casings of the character described are usually fitted is by being hinged thereto, and the opposite meeting edges of the body and cover of the casing are produced each in single parallel planes, whereby any deviation in said edges caused by imperfections of finish or through warping or otherwise forms interstices which permit the ready passage of dust and other foreign particles, besides rendering the interior of the coil-casing susceptible to the influence of a moist condition of the atmosphere.

In so delicate an organism as that presented by the elements of an ind uction-coil it is highly essential to rigorously exclude all such deleterious influences, for the vibrator, with its supporting and adjusting members, as well as the terminal connections, are prone with the aid thereof to become short-circuited, to the detriment of the proper working of the coil, wherefore it will be appreciated that the importance of means conveniently and effectually insuring an absolute closure cannot be overestimated.

The accompanying drawings show a casing containing two coils.

It will be understood that the improvements included herein are equally applicable to a casing containing only a single coil or a larger number thereof.

In the figures, A indicates the body or main portion of the coil-easing, and B a separate member or cover adapted to fit thereover and inclose the exposed coil-fittings. As usual, the member A contains the coil-windings, core, and condenser and is filled with paraffin-wax or other like insulating substance, as A, through which the conductor-terminals are led. A sheet 0, of hard rubber. or other rigid insulat ing material, covers the upper surface of the insulating-filling and serves as a support for the bridge, as D, the vibrator-mount, as E, and the primary bindingposts, as F. The upper edge of the member A is provided throughout its extent with an outer continuous notch, as a, forming a substantially rightangular obverse recess, while the lower edge of the cover member B correspondingly is provided throughout its extent with an inner continuous notch, as 7), forming a substantially right-angular inverse recess.

As is obvious, the relative arrangement of the outer and inner notches upon members A and B may be transposed without departing from the spirit of my invention, and I further lay claim to all such modifications and changes as are clearly the equivalent of my improvement.

. The respective widths and depths of the said obverse and reverse notches are substantially equal, whereby when the members A and B are fitted together the respective planes formed by said notches are in close parallel contiguity, the material about said notches forming a practically homogeneous wall, the members thereof being divided only by a closely-fitting angular joint which effectively excludes the entry of all foreign particles and moisture to the interior of the casing.

My improved means for passing the conductor-wires through the casing consists in forming a diagonal orifice leading from the upper surface of the insulating-sheet C and penetrating said sheet, also penetrating the paraffin-wax or other insulating substance with which the casing is filled and the side wall of the casing. Within said orifice is snugly fitted a tube, as H, of hard rubber or other insulating material, the opposite ends of which may be cut diagonally to lie flush with the respective surfaces of sheet 0 and easing B, within which they are located. The inclination afforded the tubes H positively prevents rain from falling or beating into the coil-casing through their passages, and, further, the interior diameter of the tubes H is of an area or bore capable of receiving snugly the conductor-wires, whereby the presence of the latter prevents the passage of foreign particles through said tubes.

For convenience in manufacture 1 may cause the orifices to taper outwardly, so that by giving a corresponding taper or cone-like conformation to the tubes H the latter members may be more readily and securely fitted therein, entering and driving them in from the exterior of the casing-wall.

The secondary terminals (one only of which is shown in the drawings) may pass out at the base of the casing, as shown, or from a side thereof. In the construction illustrated an exteriorly-threaded disk I, of non-conducting material, is placed against the outside of the casing, and a post J is passed through the casing and said disk, receiving a washer K upon its exterior portion to secure the members and form a seat for a nut L, which also screws upon post J, the terminals of the winding and conductor being clamped between said washer and nut. The terminal winding passes out through an orifice M, bored through the casing, disk I, and washer K, and the conductor-terminal enters through an aperture 12, formed in an inclosing cap, as N, which latter member is of non-condueting material aind is interiorly threaded to screw upon the c isk 1.

Having now described my invention, I declare that what I claim is- 1. The combination with an induction-coil of a casing therefor, an insulating substance filling out said casing, a top sheet of insulating material whose upper surface is flush with the perimeter of said casing, and coil-fittings supported upon said top sheet; together with a removable cover for said casing having an interior capacity sufficient to receive said coilfittings, the meeting edges of said casing and cover being reversely notched, permitting said members to fit together with a continuous, substantially right-angular joint.

2. The combination with an induction-coil of a casing therefor, an insulating substance filling out said casing, and a top sheet of insulating material supporting the coil-fittings, said top sheet, insulating-filling, and a side wall of the casing being provided with one or more alined perforations extending diagonally thcrethrough, and an insulating-tube snugly inserted within each of said perforations to provide a passage for a conducting-wire.

3. The combination with an induction-coil of a casing therefor, an insulating substance filling out said casing, and a top sheet of insulating material supporting the coil-fittings, said top sheet, insulating-filling, and a side wall of the casing being provided with one or more inwardly-tapering, alined perforations extending diagonally therethrough, and an insulating-tube whose exterior surface is tapered, snugly inserted within each of said perforations to provide a passage for a conducting-wire.

4. The combination with an ind uction-coil, a casing therefor and a threaded disk of nonconducting material secured against said casing-wall, of a hollow cap of non-conducting material screwed upon said disk, a bindingpost passed through the casing-wall and said disk and inclosed by said cap, means upon said post to secure a secondary terminal introduced thereto through an orifice in the easing and disk, and an aperture in said cap for the passage of a conductor-terminal to said binding-post.

Signed at New York this 17th day of July, 1903.

CHARLES F. SPLITDORF.

WVitnesses:

FREDERICK O. BoNNY, F. \V. BARKER. 

